This video shows how to calculate the drainage density for catchment (Basin / Watershed / Subwatershed using the stream line and catchment boundary using ArcGIS.
Drainage density (DD): The total length of all streams per unit area is called drainage density.

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Step 1: Project layers to local projection system
(Data management tools Projections and Transformation Project)
(Project: Projects spatial data from one coordinate system to another.)

Step 2: Grid Index for Basin / Watershed / SubWatershed
(Cartographic Tool Data Driven Pages Grid Index)
Units: Kilometers / Miles

Step 3: Clip
Clip Grids with Basin / Watershed / SubWatershed
(Analysis Tool Extract Clip)
Environments: Output Coordinate

Step 4: Intersect Tool
Computes a geometric intersection of the input features. Features or portions of features which overlap in all layers and/or feature classes will be written to the output feature class.
(Analysis Tool Overlay Intersect)
Units: Meters
Environments: Output Coordinate

Step 5: Dissolve Tool
The field or fields on which to aggregate features.
(Data management tools Generalization Dissolve)
Dissolve using Page Number
Environments: Output Coordinate

Step 6: Calculate Stream Length using Geometry Calculator
Units: Meters / Kilometers / Miles

Reminder: Check Units, It must same in Stream_Length / Watershed_Grid (Kilometers)
Step 7: Join Watershed_Grid with Stream_Length

Step 8: Area Calculation for Watershed_Grid

Drainage Density (D) expressed in following units (km/km2),
D = L/A
L= Total Stream length
A= Area of Watershed / Basin

Step 9: Drainage Density (D)
Create New Field “DD” & Calculate Drainage Density
The result is drainage density for specific grid area

Step 10: Features to Point

Step 11: Inverse Distance Weighted (IDW)


#calculating #drainagedensity #arcgis #stream #hydrology #geospatialanalysis